JP2960787B2 - 2D displacement detector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-dimensional displacement detector mainly used as an input device for operation of a control machine and a multidirectional operation to a display device such as a CRT.

[0002]

2. Description of the Related Art Hitherto, a two-dimensional displacement detector called a joystick using two potentiometers has been used as an input device for operation of a control machine or multidirectional operation to a display device such as a CRT. FIG. 7 is a perspective view showing an example of the joystick.
1 and is coupled so that its input shaft moves in conjunction with the movement of the lever 30 in the X direction. Thus, the potentiometer 35 can indicate the movement of the lever 30 in the X direction by its resistance change.

The movable section 31 is supported by a fixed section 32 fixed to a base 33 so as to move in conjunction with the movement of the lever 30 in the Y direction. A potentiometer 34 is fixed to the fixed section 32 and the movable section 31 is fixed. The input shaft is connected so as to move in conjunction with the movement of the robot. Thus, the potentiometer 34 can indicate the movement of the lever 30 in the Y direction by its resistance change. As described above, by using the joystick, two displacements can be indicated by resistance changes at the same time by tilting the lever 30, and the joystick can be used as an input device for two parameters such as a direction.

[0004]

The potentiometer used in the joystick described above generally has an electrode which slides on a resistor in conjunction with an input shaft. Therefore, there is a problem that the electrodes are easily worn and the life as a two-dimensional displacement detector is shortened.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a long-life two-dimensional displacement detector.

[0006]

The present invention particularly relates to a two-dimensional displacement detector mainly used as an input device for the operation of a control machine or a multi-directional operation to a display device such as a CRT. The object of the present invention is to provide a magnetic plate having four teeth on the same plane , wherein the four teeth are in opposite phases when energized. The first winding is wound around all of the teeth, and non-adjacent ones of the four teeth are combined into two sets, and the magnetic poles of the opposing teeth of each set are in the opposite phase when energized. As described above, a stator in which a second winding and a third winding are wound on each of the two sets, and a region surrounded by the four teeth can be moved with two degrees of freedom. A slider made of a magnetic material in which each part facing the four teeth has the same shape; Oh on equidistant from the four teeth
With the joint having a fulcrum as a fulcrum, a lever for penetrating the center portion of the slider is additionally provided, so that the above-described configuration further includes an excitation unit that applies an excitation signal to the first winding; Analog / digital conversion means for converting the signals output from the second and third windings into numerical values, respectively, and two numerical values converted by the analog / digital conversion means into displacement amounts of the slider in two directions. This is achieved by additionally providing a numerical value conversion means for performing conversion.

[0007]

The two-dimensional displacement detector of the present invention utilizes the change in magnetism to detect the displacement, so that the life of the two-dimensional displacement detector itself can be prolonged by using a non-contact structure for the detection unit.

[0008]

FIG. 1 is a perspective view showing an example of a two-dimensional displacement detector according to the present invention, FIG. 3 is a plan view thereof, and FIG. 4 is a sectional view taken along line II of FIG.

The stator 16 is made of a soft magnetic material such as a silicon steel plate and has four teeth 12 provided on the same plane in four directions.
13, 14, 15 are fixed to the casing 20.
Further, the coils 1, 13, 14, and 15 emit magnetic fluxes of four loops as shown by arrows in FIG. 3 when energized, and the winding 1 is bobbin so that the magnetic poles of the adjacent teeth have opposite phases. It is wound through 4, 5, 6, and 7. The sets of 12 and 14 and the set of 13 and 15 that are not adjacent to each other among the four teeth are provided with windings 2 in a direction to cancel the electromotive voltage against the magnetic flux.
And 3 are wound via bobbins 8, 10 and 9, 11, respectively. In other words, the windings 2 and 3 are wound so that when the windings 2 and 3 are energized, the magnetic poles of the opposing teeth 12, 14 and 13, 15 have opposite phases.

The slider 17 is made of a soft magnetic material such as a silicon steel plate, and has a circular shape in which the portions facing the teeth 12, 13, 14, and 15 always have the same shape. The slider 17 is always supported by a guide 19 so as to be kept horizontal.
Joint 2 equidistant from 2,13,14,15
A lever 18 having the fulcrum 6 as a fulcrum is provided. Therefore,
The slider 17 moves horizontally in the direction in which the lever 18 is tilted, and the slider 17 moves in two directions of freedom in the X direction and the Y direction in accordance with the movement of the lever 18.

FIG. 2 is a block diagram showing an example of a detecting device using the above-described two-dimensional displacement detector of the present invention. The microcomputer 40 is provided with a data request command S by a fixed period of time or by external serial communication.
At the timing when COM is received via the serial communication interface 44, an excitation command signal PO is output to the excitation circuit 41. The excitation circuit 41 outputs an excitation command signal P
When O is received, the teeth 12, 13, 14, 15 of the stator 16 are received.
Is excited by a square wave pulse signal P1. At this time, if the position equidistant from the four teeth is the origin of the rectangular coordinates XY and the position of the center of the slider 17 is represented by the coordinates (XC, YC) of the rectangular coordinates XY, the windings 2 and 3
The electromotive voltage signals P2 and P3 output from the
Due to the difference in magnetic resistance due to the difference in air gap between the sliders 3, 14, 15 and the slider 17, the signal P1 which substantially excites the winding 1 becomes a signal whose amplitude is modulated by XC and YC.

The electromotive voltage signal P output from the windings 2 and 3
2 and P3 are digitized into numerical signals DX and DY by A / D converters 42 and 43, respectively, and output to the microcomputer 40. The microcomputer 40 corrects a detection error and the like included in the numerical signals DX and DY,
It performs unit conversion, coordinate conversion, and the like, and outputs two numerical signals D1 and D2 indicating the displacement of the slider 17 to the serial communication interface 44. The serial communication interface 44 outputs the two numerical signals D1 and D2 indicating the displacement of the slider 17 to the outside as serialized numerical signals SD1 and SD2.

FIG. 5 is a plan view showing another example of the two-dimensional displacement detector of the present invention, and FIG. 6 is a sectional view taken along the line II of FIG.
The same components as those of FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted.

The stator 24 is made of a soft magnetic material such as a silicon steel plate and has four teeth 12, 1 provided on the same plane in four directions.
3, 14, 15 are fixed to the casing 23. Further, a winding 1 is wound around each of the teeth 12, 13, 14, 15 via bobbins 4, 5, 6, 7, similarly to the two-dimensional displacement detector of FIG. The windings 2 and 3 are connected to the sets of 12 and 14 and the set of 13 and 15 which are not adjacent to each other among the four teeth via the bobbins 8, 10 and 9 and 11, respectively. It is wound in the same way as.

The slider 25 is made of a soft magnetic material such as a silicon steel plate, and has a square shape in which the portions facing the teeth 12, 13, 14, 15 are always the same in shape. A lever 21 having a universal joint 22 as a fulcrum equidistant from the teeth 12, 13, 14, 15 is penetrated and connected to the center of the slider 25. Therefore, the slider 25 always moves the teeth 12,
The direction in the XY plane of the surface facing 13, 14, 15 moves without changing, and the slider 25 moves in two degrees of freedom in the X and Y directions substantially in accordance with the movement of the lever 21. Has become.

In such a two-dimensional displacement detector, four
If the position equidistant from the teeth is the origin of the rectangular coordinates XY and the position of the center of the slider 25 is represented by the coordinates (XC, YC) of the rectangular coordinates XY, when the winding 1 is excited, The two electromotive voltage signals output from 3 are
Due to the difference in magnetic resistance due to the difference in air gap between the sliders 13, 14, 15 and the slider 25, the signal obtained by substantially exciting the winding 1 is amplitude-modulated by XC and YC. Therefore, if connected to the detection device shown in FIG. 2 or the like, the displacement of the slider 25 can be numerically detected.

Note that the four teeth of the stator face outward,
The present invention can be realized with a structure in which the slider surrounds the stator. Further, the excitation of the winding by the detection device can be performed not only by a pulse but also by an AC such as a sine wave.

[0018]

As described above, according to the two-dimensional displacement detector of the present invention, it is possible to eliminate the contact portion, that is, the friction portion, of the detecting portion such as the conventional joystick, so that it has a long life and environmental resistance. And high detection reliability can be maintained. Further, since the structure is simple, the cost can be reduced. Furthermore, the four teeth are on the same plane
And a short magnetic loop between each tooth through the slider
Formed, and efficient displacement detection due to the decrease in magnetic resistance
It becomes possible. The four teeth are made of silicon steel plate with the stator
It is formed with high precision by punching etc. from a plate of soft magnetic material such as
It is arranged and arranged, and is easy to manufacture.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a two-dimensional displacement detector of the present invention.

FIG. 2 is a block diagram showing an example of a detecting device using the two-dimensional displacement detector shown in FIG.

FIG. 3 is a plan view of the two-dimensional displacement detector shown in FIG.

FIG. 4 is a cross-sectional view of the two-dimensional displacement detector shown in FIG. 3 taken along the line II.

FIG. 5 is a plan view showing another example of the two-dimensional displacement detector of the present invention.

FIG. 6 is a sectional view taken along line II of the two-dimensional displacement detector shown in FIG. 5;

FIG. 7 is a perspective view showing an example of a joystick which is a conventional two-dimensional displacement detector.

[Explanation of symbols]

 1 winding 2 winding 3 winding 12 teeth 13 teeth 14 teeth 15 teeth 16 stator 17 slider 24 stator 25 slider 40 microcomputer 41 excitation circuit 42 A / D converter 43 A / D converter 44 serial communication interface

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06F 3/033 G01B 7/00 G05G 9/047

Claims (4)

(57) [Claims] 1. A magnetic material having four teeth on the same plane .
A plate, a first winding wound on the all four teeth so that the four magnetic poles of the teeth adjacent Among thus in opposite states when energized, next to one of the four teeth Two sets of non-matching teeth are combined to form two sets, and a second winding and a third winding are wound around each of the two sets so that the magnetic poles of the opposing teeth of each set are in the opposite phase when energized. And a movable part having two degrees of freedom in a region surrounded by the four teeth.
A two-dimensional displacement detector, comprising: a slider made of a magnetic material in which each part facing the teeth has the same shape. 2. The two-dimensional displacement detector according to claim 1, wherein the shape of the slider is a circle. 3. A joy equidistant from said four teeth.
Lever to make cement and fulcrum, the two-dimensional displacement detector according to claim 1 which is <br/> fitted through a central portion of the slider. 4. An excitation unit for applying an excitation signal to the first winding, and an analog / digital unit for digitizing signals output from the second and third windings during the application of the excitation signal. Conversion means, and the two numerical values converted by the analog / digital conversion means into two values of the slider.
2. A detector using the two-dimensional displacement detector according to claim 1, further comprising numerical value conversion means for converting the displacement into a direction displacement.